| 单词 | supernova |
| 释义 | supernova An explosive brightening of a star in which the energy radiated by it increases by a factor of 1010. It takes several years to fade and while it lasts dominates the whole galaxy in which it lies. It is estimated that there could be a supernova explosion in the Milky Way every 30 years, although only six have actually been observed in the last 1000 years. A supernova explosion occurs when a star has burnt up all its available nuclear fuel and the core collapses catastrophically (see stellar evolution). Compare nova |
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